kicad/common/preview_items/arc_geom_manager.cpp

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/*
* This program source code file is part of KiCad, a free EDA CAD application.
*
* Copyright (C) 2017 Kicad Developers, see AUTHORS.txt for contributors.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, you may find one here:
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
* or you may search the http://www.gnu.org website for the version 2 license,
* or you may write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <preview_items/arc_geom_manager.h>
#include <math/util.h> // for KiROUND
using namespace KIGFX::PREVIEW;
///> Snap an angle to the nearest 45 degrees
static double snapAngle( double aAngle )
{
return KiROUND( aAngle / M_PI_4 ) * M_PI_4;
}
bool ARC_GEOM_MANAGER::acceptPoint( const VECTOR2I& aPt )
{
switch( getStep() )
{
case SET_ORIGIN:
return setOrigin( aPt );
case SET_START:
return setStart( aPt );
case SET_ANGLE:
return setEnd( aPt );
case COMPLETE:
break;
}
return false;
}
void ARC_GEOM_MANAGER::SetClockwise( bool aCw )
{
m_clockwise = aCw;
m_directionLocked = true;
setGeometryChanged();
}
void ARC_GEOM_MANAGER::ToggleClockwise()
{
m_clockwise = !m_clockwise;
m_directionLocked = true;
setGeometryChanged();
}
VECTOR2I ARC_GEOM_MANAGER::GetOrigin() const
{
return m_origin;
}
VECTOR2I ARC_GEOM_MANAGER::GetStartRadiusEnd() const
{
return m_origin + VECTOR2I( m_radius, 0 ).Rotate( m_startAngle );
}
VECTOR2I ARC_GEOM_MANAGER::GetEndRadiusEnd() const
{
return m_origin + VECTOR2I( m_radius, 0 ).Rotate( m_endAngle );
}
double ARC_GEOM_MANAGER::GetRadius() const
{
return m_radius;
}
double ARC_GEOM_MANAGER::GetStartAngle() const
{
double angle = m_startAngle;
if( m_clockwise )
angle -= 2 * M_PI;
return -angle;
}
double ARC_GEOM_MANAGER::GetSubtended() const
{
double angle = m_endAngle - m_startAngle;
if( m_endAngle <= m_startAngle )
angle += 2 * M_PI;
if( m_clockwise )
angle -= 2 * M_PI;
return -angle;
}
bool ARC_GEOM_MANAGER::setOrigin( const VECTOR2I& aOrigin )
{
m_origin = aOrigin;
m_startAngle = 0.0;
m_endAngle = 0.0;
return true;
}
bool ARC_GEOM_MANAGER::setStart( const VECTOR2I& aEnd )
{
const auto radVec = aEnd - m_origin;
m_radius = radVec.EuclideanNorm();
m_startAngle = radVec.Angle();
if( m_angleSnap )
m_startAngle = snapAngle( m_startAngle );
// normalise into 0-2Pi
while( m_startAngle < 0 )
m_startAngle += M_PI * 2;
m_endAngle = m_startAngle;
return m_radius != 0.0;
}
bool ARC_GEOM_MANAGER::setEnd( const VECTOR2I& aCursor )
{
const auto radVec = aCursor - m_origin;
m_endAngle = radVec.Angle();
if( m_angleSnap )
m_endAngle = snapAngle( m_endAngle );
// normalise into 0-2Pi
while( m_endAngle < 0 )
m_endAngle += M_PI * 2;
if( !m_directionLocked )
{
double ccwAngle = m_endAngle - m_startAngle;
if( m_endAngle <= m_startAngle )
ccwAngle += 2 * M_PI;
double cwAngle = std::abs( ccwAngle - 2 * M_PI );
if( std::min( ccwAngle, cwAngle ) >= M_PI_2 )
m_directionLocked = true;
else
m_clockwise = cwAngle < ccwAngle;
}
else if( std::abs( GetSubtended() ) < M_PI_2 )
{
m_directionLocked = false;
}
// if the end is the same as the start, this is a bad point
return m_endAngle != m_startAngle;
}